Siemens DataNET Hub (DNH) 사용자 설명서

다운로드
페이지 97
 
2000585-001 
Installation 
••••  31 
DataNET Copper Connections, 
Continued 
 
Behind each single port connector is an associated jumper pin block, see 
Figure 2-1. Each block is used to select the termination impedance of its 
associated port to match the cable’s own impedance characteristics. The 
three selections for each port are 100-ohm, 120-ohm and 150-ohm. Use 
the 150-ohm setting for the recommended cable. If the specific cable 
impedance is not known use the 100 ohm setting. Select the impedance 
setting that matches the cable impedance by placing the shorting jumper 
across the selected pins. 
 
The Hub Signal Equalizer board balances the attenuation of signals 
when varying lengths of copper cable connect multiple downlinks from a 
HUB. The board plugs into a port connector and is wired to its associated 
downlink port. See DataNET Hub Signal Equalizer Board, page 34 for 
determining the attenuator board settings. 
 
If you are using a cable other then the recommended cable types, the 
cable signals for each channel must be measured at the DNH port con-
nection. These signal measurements are used to determine the attenu-
ator settings for a DataNET Hub Signal Equalizer Board; see page 34.  
 
Refer to Site Wiring Requirements. Table 2-1 (page 19) to determine the 
requirements for your site. 
 
All downlink connections are made to any of the eight-downlink ports. 
When a Signal Equalizer board is used the network wiring must connect 
to TB1 on the signal equalizer board. 
Always ensure that the same port number is used for redundant channel 
connections i.e. Channel A to Port 1 on ‘A’ Hub and Channel B to Port 1 
on ‘B’ hub.  
Cable Impedance 
Settings 
DataNET Hub Signal 
Equalizer Board 
Using Other than 
Recommended Cable 
Recommended Cable 
Downlink Port 
Connections 
+ Important